A5013540967- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Molecular Spectroscopy and Structure
- Astro and Planetary Science
- Atmospheric Ozone and Climate
- Astronomy and Astrophysical Research
- Spectroscopy and Laser Applications
- Radio Astronomy Observations and Technology
- Galaxies: Formation, Evolution, Phenomena
- Superconducting and THz Device Technology
- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Spacecraft and Cryogenic Technologies
- Advanced Chemical Physics Studies
- Astronomical Observations and Instrumentation
- Atomic and Molecular Physics
- Astrophysical Phenomena and Observations
- Space Exploration and Technology
- History and Developments in Astronomy
- Adaptive optics and wavefront sensing
- Planetary Science and Exploration
- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Quantum, superfluid, helium dynamics
- Cold Atom Physics and Bose-Einstein Condensates
National Radio Astronomy Observatory
2013-2024
RIKEN
2024
Pioneer (Japan)
2024
Stockholm University
2022
Max Planck Institute for Astronomy
2019
Max Planck Society
2019
Union astronomique internationale
2002
Universidad de Guanajuato
2002
Center for Astrophysics Harvard & Smithsonian
2002
U.S. National Science Foundation
1997-2000
We present Atacama Large Millimeter/submillimeter Array (ALMA) observations from the 2014 Long Baseline Campaign in dust continuum and spectral line emission HL Tau region. The images at wavelengths of 2.9, 1.3, 0.87 mm have unprecedented angular resolutions 0 075 (10 AU) to 025 (3.5 AU), revealing an astonishing level detail circumstellar disk surrounding young solar analog Tau, with a pattern bright dark rings observed all wavelengths. By fitting ellipses most distinct rings, we measure...
The Atacama Large Millimeter/submillimeter Array (ALMA) is an international radio telescope under construction in the Desert of northern Chile. ALMA situated on a dry site at 5000 m elevation, allowing excellent atmospheric transmission over instrument wavelength range 0.3 to 10 mm. will consist two arrays high-precision antennas. One, up 64 12-m diameter antennas, reconfigurable multiple patterns ranging size from 150 meters ~15 km. A second array comprised set four and twelve 7-m antennas...
The close approach to the Earth of Comet C/1996 B2 (Hyakutake) in March 1996 allowed searches for minor volatile species outgassed from nucleus. We report detection deuterated water (HDO) through its 101–000rotational transition at 464.925 GHz using Caltech Submillimeter Observatory. also present negative results a sensitive search theJ(5–4) line hydrogen cyanide (DCN) 362.046 GHz. Simultaneous observations two rotational lines methanol together with HDO same spectrum allow us determine...
view Abstract Citations (196) References (112) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Formaldehyde as a Probe of Physical Conditions in Dense Molecular Clouds Mangum, Jeffrey G. ; Wootten, Alwyn We present detailed analysis describing the utility formaldehyde (H2CO) molecule derivation kinetic temperature and spatial density within molecular clouds. Measurements 13 transitions from both ortho para species H2CO have been made toward sample 11 active...
A major goal of the Atacama Large Millimeter/submillimeter Array (ALMA) is to make accurate images with resolutions tens milliarcseconds, which at submillimeter (submm) wavelengths requires baselines up ~15 km. To develop and test this capability, a Long Baseline Campaign (LBC) was carried out from September late November 2014, culminating in end-to-end observations, calibrations, imaging selected Science Verification (SV) targets. This paper presents an overview campaign its main results,...
The finding of residual gas in the large central cavity HD142527 disk motivates questions on origin its non-Keplerian kinematics, and possible connections with planet formation. We aim to understand physical structure that underlies intra-cavity gaseous flows, guided by new molecular-line data CO(6-5) unprecedented angular resolutions. Given warped inferred from identification scattered-light shadows cast outer disk, kinematics are consistent, first order, axisymmetric accretion onto inner...
A pathway to the formation of planetesimals, and eventually giant planets, may occur in concentrations dust grains trapped pressure maxima. Dramatic crescent-shaped have been seen recent radio images at sub-mm wavelengths. These disk asymmetries could represent initial phases planet trap scenario, provided that grain sizes are spatially segregated. testable prediction azimuthal trapping is progressively larger should be more sharply confined furthermore follow a distribution markedly...
We present initial results of very high resolution Atacama Large Millimeter/submillimeter Array (ALMA) observations the z = 3.042 gravitationally lensed submillimeter galaxy HATLAS J090311.6+003906 (SDP.81). These were carried out using a extended configuration as part Science Verification for 2014 ALMA Long Baseline Campaign, with baselines up to ∼15 km. continuum imaging at 151, 236, and 290 GHz unprecedented angular resolutions fine 23 mas, corresponding an unmagnified spatial scale ∼180...
view Abstract Citations (175) References (22) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Duplicity of IRAS 16293-2422: A Protobinary Star? Wootten, Alwyn Continuum maps at wavelengths 6 cm and 2 the region surrounding infrared object 16293-2422 reveal two related sources, B separated by ∼5" (750 AU) along P.A. -50°. These sources lie within 3 mm continuum source mapped Mundy, Wilking, Myers, which located density maxima dust disk core L1689N...
We give a detailed presentation of all the data from multiepoch 22 GHz H2O maser survey mainly toward low-mass young stellar objects (YSOs) using Nobeyama 45 m telescope and Very Large Array (VLA). Our major results are already published (our Paper I). The is first complete known Class 0 sources in northern sky (δ > -35°) one most sensitive surveys ever performed. was conducted 1996 May through 1999 March over 32 periods. A total 606 observations were carried out 173 YSOs, including 36...
view Abstract Citations (286) References (53) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Mass loss from evolved stars. I. Observations of 17 stars in the CO(2-1) line. Knapp, G. R. ; Phillips, T. Leighton, B. Lo, K. Y. Wannier, P. Wootten, H. A. Huggins, J. 29 CO J = 2-1 line are reported. For stars, emission circumstellar molecular gas is detected. Four (R Leo, R LMi, RX Boo, and Alpha Ori) detected as sources for first time. The data analyzed using a...
We present Atacama Large Millimeter/submillimeter Array (ALMA) observations of the [C ii] 157.7 μm fine structure line and thermal dust continuum emission from a pair gas-rich galaxies at z = 4.7, BR1202-0725. This system consists luminous quasar host galaxy bright submillimeter (SMG), while fainter star-forming is also spatially coincident within 4'' (25 kpc) region. All three are detected in continuum, indicating FIR luminosities excess 1013 L☉ for two most objects. The SMG both with L[C...
Context. The Orion Kleinmann-Low nebula (Orion-KL) is a complex region of star formation. Whereas its proximity allows studies on scale few hundred AU, spectral confusion makes it difficult to identify molecules with low abundances.
view Abstract Citations (143) References (51) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Cold DCO + Cores and Protostars in the Warm rho Ophiuchi Cloud Loren, Robert B. ; Wootten, Alwyn Wilking, Bruce A. The decrease of DCO(+) abundance with elevation a cloud's T(K) is used to identify cluster dozen coldest, youngest dense cores embedded L1688, L1689, L1709 clouds Rho complex. Most L1688 have = 12-14 K, about half that indicated by CO throughout L1688....
We have used the NRAO Very Long Baseline Array to image water masers associated with low-luminosity, young stellar object (YSO) IRAS 05413-0104 at four epochs over a period of 10 weeks. The maser images show detail symmetric, jetlike structure about 300 mas in extent. 23° ± 2° position angle spot distribution is excellent agreement measured angles for observed larger scale H2 and SiO emission distributions; radial velocities are measurements showing redshifted gas southwest blueshifted...
view Abstract Citations (134) References (47) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS IRAS 16293-2422: A Very Young Binary System? Mundy, Lee G. ; Wootten, Alwyn Wilking, Bruce A. Blake, Geoffrey Sargent, Anneila I. high spatial resolution millimeter and centimeter wavelength observations of a proposed proto-binary system in the nearby (160 pc) Ophiuchus molecular complex are presented. Flux measurements from 18 cm to 25 microns show that majority...
view Abstract Citations (92) References (48) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Synthesis Imaging of the DR 21 (OH) Cluster. II. Thermal Ammonia and Water Maser Emission Mangum, Jeffrey G. ; Wootten, Alwyn Mundy, Lee Results high-sensitivity, 4-arcsec-resolution imaging thermal ammonia water maser emission molecular cloud are presented. Images NH3(1, 1) 2, 2) transitions show four primary regions embedded in a generally clumpy distribution. A...
view Abstract Citations (139) References (11) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Observations of DCO+: the electron abundance in dark clouds. Guelin, M. ; Langer, W. D. Snell, R. L. Wootten, H. A. The J equals 2-1 rotational line DCO(plus) has been definitely detected five molecular clouds, including three L63, L134, and L134 N, marginally four others. emission mapped N extends over a region 3 arcmin. DCO(plus)/HCO(plus) ratio found at centers...
view Abstract Citations (162) References (21) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Molecular abundance variations in interstellar clouds. Wootten, A. ; Evans, N. J., II Snell, R. vanden Bout, P. The abundances of several molecular species have been obtained for 13 regions a variety were by establishing temperature and density model the through use CO H2CO observations. Then HCO(+), H2CO, HNC, HCN, (C-13)O determined comparing with observed lines....
We used several data sets from the Plateau de Bure Interferometer to map dimethyl ether emission in Orion-KL with different arcsec spatial resolutions and energy levels compare our previous methyl formate maps. Our show remarkable similarity between (CH3OCH3) (HCOOCH3) distributions even on a small scale (1.8"x0.8" or about 500 AU). This long suspected similarity, seen both observational theoretical arguments, is demonstrated unprecedented confidence, correlation coefficient of maps 0.8. A...
Using the Green Bank Telescope, we have obtained accurate measurements of 14N/15N isotopic ratio in ammonia two nearby cold, dense molecular clouds, Barnard 1 and NGC 1333. The 1, 334 ± 50 (3σ), is particularly well constrained falls between local interstellar medium/proto-solar value ∼450 terrestrial atmospheric 272. 1333 measurement consistent with result, but has a larger uncertainty. We do not see evidence for very high 15N enhancements seen cometary CN. Sensitive observations larger,...
The Barnard 1b core shows signatures of being at the earliest stages low-mass star formation, with two extremely young and deeply embedded protostellar objects. Hence, this is an ideal target to study structure chemistry first objects formed in collapse prestellar cores. We present ALMA Band 6 spectral line observations ~0.6'' angular resolution towards 1b. have extracted spectra both protostars, used a Local Thermodynamic Equilibrium (LTE) model reproduce observed profiles. B1b-S rich...
We present the first interferometric imaging of molecular line emission from Ring Nebula, NGC~6720, in form Submillimeter Array (SMA) observations CO $J=2\rightarrow 1$ emission. The SMA $^{12}$CO(2--1) mapping data, with $\sim$3$''$ spatial resolution and 2 km s$^{-1}$ velocity resolution, provide an unprecedentedly detailed, 3D view Ring's clumpy envelope. morphology velocity-integrated image closely resembles those near-IR H$_2$ PAH JWST/NIRCam gas forming a geometrically thin layer...